Fumigant formulation for drip application

Abstract

The present invention relates to the field of soil fumigation, and more particularly to a fumigant formulation comprising from 0.10% to 0.4% by weight of fumigant, said formulation being particularly suitable for dropwise administration, and also to the use thereof. The present invention also relates to a method of pesticide treatment by fumigation of soils and/or substrates that employs such a formulation, administered dropwise.

1 . A method for pesticide treatment by fumigation of soils and/or substrates, in which a formulation F is administered dropwise,
 the formulation F comprising water and between 0.10% and 0.40% by volume of a composition C, relative to the total volume of water in the formulation F, and   the composition C comprising:   at least 80% by weight, of at least one fumigant compound, relative to the total weight of the composition C;   between 0.1% and 20% by weight of at least one surfactant, relative to the total weight of the composition C; and   optionally an odour-masking agent.   
     
     
         2 . The method according to  claim 1 , wherein the formulation F is an emulsion. 
     
     
         3 . The method according to  claim 1 , wherein the formulation F comprises between 0.10% and 0.30% by volume of the composition C, relative to the total volume of water in the formulation F. 
     
     
         4 . The method according to  claim 1 , wherein said the fumigant compound is chosen from the-compounds of general formula (1) below:
   R—S(O) n —S x —R′  (1)
   wherein R is selected from a linear or branched alkyl radical containing from 1 to 4 carbon atoms, and a linear or branched alkenyl radical containing from 2 to 4 carbon atoms; n is equal to 0, 1 or 2; x is an integer from 0, 1, 2, 3 or  4 ;   R′ selected from a linear or branched alkyl radical containing from 1 to 4 carbon atoms, and a linear or branched alkenyl radical containing from 2 to 4 carbon atoms or, only when n=x=0, a hydrogen or alkali metal atom.   
     
     
         5 . The method according to  claim 1 , wherein the fumigant compound is dimethyl disulfide. 
     
     
         6 . The method according to  claim 1 , wherein the composition C comprises:
 at least 90% by weight of dimethyl disulfide, relative to the total weight of the composition C,   between 1% and 10% by weight of at least one surfactant, relative to the total weight of the composition C, and   optionally between 0.1% and 0.5% by weight of an odour-masking agent, relative to the total weight of the composition C.   
     
     
         7 . The method according to  claim 6 , wherein the DMDS is administered as a mixture or separately with another fumigant compound selected from the group consisting of:
 1,3-dichloropropene, sulfuryl fluoride (SO 2 F 2 ), phosphine, methyl iodide, chloropicrin (Cl 3 C—NO 2 ), metam-sodium (CH 3 —NHCS 2 Na), sodium tetrathiocarbonate (Na 2 CS 4 ), methyl isothiocyanate (CH 3 NCS), dazomet (tetrahydro-3,5-dimethyl-1,3,5-thiadiazine-2-thion), AITC (allyl isothiocyanate) and EDN (ethanedinitrile).   
     
     
         8 . The method according to  claim 1 , wherein dropwise application is performed by a drip irrigation device comprising a dosing device for the composition C. 
     
     
         9 . A formulation F comprising water and between 0.10% and 0.40% by volume of a composition C, relative to the total volume of water in the formulation F, and
 the composition C comprising:   at least 80% by weight of at least one fumigant compound, relative to the total weight of the composition C;   between 0.1% and 20% by weight of at least one surfactant, relative to the total weight of the composition C; and   optionally an odour-masking agent.   
     
     
         10 . A method for fumigating soils and/or substrates with the formulation F as defined in  claim 1 , where the formulation F is administered to the soils and/or substrates dropwise. 
     
     
         11 . A kit for drip fumigation of soils and/or substrates, comprising the composition C as defined in  claim 1 , and also a dosing device for the composition C.